Planoorapk co



1. H. WILSON.

STAMPmG MACHINE FOR CUTIING OUT ARTICLES FROM'SHEET METAL.

nrucnlou FILED MAY 21!. 1919.

1,320,189. Patented Oct 28,1919.

- the said tool fliitc tesi fi ar W s n; OF limtfivlmmisi attest.

' srmrmii nn'oninnron ourrmc our ARTICLES ream SHEET METAL.

Specification of Letters Patent.

I Patented Oct. 28, 1919.

Application filed May 28, 1919. Serial No. 300,881.

To all v'hom' it may concern: K v f Be it that ELTHOMAS Hnunr wm soN, a sub'jectof tlie King of GreatBritam; residing at" Aero Metal' Works,"Bra I- ley Leeds, in the county of York, En land, have invented certain new and usefu Improvements in Stamping-Machines for Cutting Out Articlestrom Sheet Metal, and of which the following is a specification. a

In the cutting out of articles In the hat from sheet metal plates by means of stem ing machines 'dies of a contour correspon" ing tn thatof the article to be cut have been employed for stamping out the article atone blow; but as afresh set of dies is required for each diifere'ntly shaped article who cut; the cost of working under this nrethod'is very considerable. It has ,also before'been proposed to fit the stamping machine with a punch or cutting tool with a View to roughly nibbling off the metal of the plate to the a proximate shape of the article required; hut-the arrangement emplo ed has been such as to only allow the n1b l ng to be effected in a more or less straight lijne, with the result that considerable'chipping and filin had to be put in afterward in order to bring the article to the finished state. l k

to provide the stamping machine with a punch or cutting tool of a construction which will enable the metal plate to be traversed under the punch in any direction at will, the arrangement being such that by using a templet on the plate, say by clamping or otherwise attaching the two together, the article according to the templet can be cut out from the plate in a, speedy and efficient manner by the nibbling action of the tool so as to necessitate only a very slight filing up of the article afterward.

According to my invention, I employ a tubular punch or cutting tool fitted w1th a central pin which is depended below its base or cutting edge for a suitable distance, and is mounted in the vertically reciprocating slide of thestamping machine in the ordinary way and is adapted to work in conjunction with the usual stationary circular die provided on the bed-plate of the machine, so that, on a sheet of metal with a templet or design attached thereto being passed under the punch or cutting. tool, the edge of the metal plate always encounters the central pin of the cutting tool so as to prevent the plate being pushed under the tool far and at the same time insure the cut ting action of the tool beingperfectly uniform."

In employing this arrangement, the central 1n of'the tool acts as a stop against who the edge of the plate is caused to bear so that the said plate can be traversed around the toolin any direction with the said pin as a fulcrum, whereby the tool is free to cut out the article to the shape of thetemplet in an efiicient manner; andby caus ng the tool to reciprocate rapidly, the cutt ng out operation can be speedily and expeditiously erformed by the rapid nib blm action 0 the tool.

T e tubular punch or cutting tool is preferably made with a cuttin edge at each end thereof so as to enable t e same to be reversed at will, and by making the said cutting edges in the form of a concave recess a grlpplng action is imparted to the tool which prevents the plate slipping back when efiecting the cut. a

The central pin is preferably loosely mounted in the tubular cutting tool, so as to enable the two parts to be tempered differentl to suit the work they are required to 7 per orni.

N w the object of this present invention In order that the invention may be clearly understood, I will proceed to describe the same with reference to the example of construction shown in the accompanying drawings; wherein Figure 1 is a sectional elevation of a portion of a stamping machine, fitted with a punch or cutting tool constructed in accordance with my invention; and Fig. 2 is a sectional plan view taken on the line A-B of Fig. 1.

According to my invention, the vertically reciprocating slide 1 of the machine is fitted with a tubular punch or cutting tool 2 having a central pin 3 depending below its base 4 and being adapted to work in conjunction with the usual stationary circular die 5 carried on the bed-plate 6 of the machine, the central pin 3 being loosely mounted in the tubular cutting tool 2 which is formed with a, cutting edge 4 at each end thereof so as tofinable the said tool 2 to be reversed at W1 The metal plate to be cut is passed into position when the cutting tool2 is in the position shown in full lines at Fig. 1; after which the slide 1 is lowered so as to bring the cutting tool 2 into the position shown in dotted lines at Fig. 1. the central pin 3 of the said tool 2 passing throu h a hole previously formed in the plate. his dotted position'is the top center position of the slide 1 which is now rapidly reciprocated so as to cause the 2 to eflect the cutting out operation, the plate under treatment being pushed forward at each cut of the tool 2 so as to cause the edge of the plate to bear against the central pin 3and so prevent the plate being pushed under the tool 2 too far and at the same time insure the cuttin ac tion of the tool 2 being preferably uni orm.

It will thus be seen that the central pin 3 of the cutting tool 2 acts as astop against which the edge of the plate is caused to hear so that the said plate can be traversed around the tool 2-in any direction with the pin?) as a fulcrum, whereb y the cutting out p ra is d r tena le at i re speedily and expeditiously penfomaedby the 1 1' id nibbling action of the toolQ.

1 he cutti edges :if of the renersible tool 2 are ma e by forming the said tool 2 with a concave recess at each endthereof, whereby a ipping action is imparted to the tool 2 so. cient to prevent the plate-slippi back when eflectmg the cut.

hat I claim as in invention and desire to secure by Letters atent 1. In a stampmgmachme for cuttin out articles in thefiat from sheet metal pates, the combination with a vertically reciprocating slide and a circular die, of a tubular punch orcutting tool carried by said ver- Cop'ies of this patent may be obtained for fire cents each, by addressing the tically reciprocating slide, and a central in depending below the base of the said tu ular punch or cutting tool and being adapted to work in conjunction with the said ClIClliar die of the machine.

2. In a stamping machine for cutting out articies in the flat from sheet metal plates, the combination with a vertically reciprocating slide and a stationary circular die, of a tubular punch or cuttmg tool carried by the said vertically reciprocatingslide, and a central pin mounted loosely in the said tubular punch or cutting tool and depending below the base thereof, the said loosely mounted central pin being adapted to Work in conjunction Wlth the stationary circular die of the machine.

3. In a stamping machine for cuttin out articles in the fiat from sheet metal pIa-tes, the combination with a vertically reciproeating slide and a stationary circular die, of a tubular punch or cutting tool formed with a cutting edge at both ends thereof and being carried by the said slide, and a central in mounted to slide in thesaid tubular punc li or cuttin tool and depending below the base thereo the said central pin being adapted to work in conjunction with the stationary circular die of the machine.

In Witness whereof I have hereunto set my hand in the presence of two Witnesses.

THOMAS HENRY WILSON.

Witnesses:

JOHN Jownrr,

V (JYRIL DELLANEY.

Commissioner of Patents,

walkington, ID. 0. 

